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  #7  
Old July 21st 05, 05:00 PM
Earle Horton
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I used to work on agricultural sprayers. Now that was some heavy duty
corrosive fluid! They use a fluid pump, much like your vehicle's water
pump. I have seen some corroded impellers, but not many. Even a really
chewed up impeller will still pump pretty well. Well enough to get methyl
parathion, mineral sulphur, and whatever else they felt like putting in the
tank, over the tops of the apple trees. Usually, it is the seal that goes
bad first. Still, if you believe that the pump is bad, take it off and look
at it.

I haven't replaced a water pump, since I switched to a policy of using pure
antifreeze, and never changing it.

Earle

"YouGoFirst" > wrote in message
...
> > My 2 cents. A water pump is a very simple device. There are only four
> > things that can go bad, the bearings, the seal, the impeller, and
> > miscellaneous leaks. You would hear the bearings if bad, or the fan

shaft
> > would be loose. I assume that you would spot a seal problem or any

leaks.
> > Loss of fluid and dripping would be your first clue. Now if the

impeller
> > were bad, then you would get poor circulation, but also at speed.
> >
> > I think we can assume that the pump is not the problem, although you

would
> > have to remove and inspect it to be absolutely sure. On some vehicles,
> > you
> > can take off the pressure cap and visually verify coolant flow, short of
> > this. I do not know whether you can do so with the GC. Do not try it
> > with
> > the engine hot. Take off the cap with the engine cool, warm it up, and
> > note
> > what happens. If you wait long enough, and the engine is really running
> > 235, it may boil over. Oops! What you are looking for, is movement in
> > the
> > coolant before this.
> >
> > Personally, I wouldn't worry too much about the gauge, unless the system
> > is
> > boiling over. Then, you have real problems. If it really bothers you,

I
> > have some suggestions. Install those hood vents that someone mentioned.
> > Buy or fabricate shims to lift up the back of the hood, like the ricers
> > with
> > big engines do. Load up the GC with camping gear, and head for the
> > mountains. It's pretty hot up here even, but the Channel 9 weather girl
> > says it's going to cool down by Saturday. She's hot too, but in a
> > different
> > way.
> >

>
> I am leaning more towards a bad impeller because I noticed thismorning as

I
> was driving into work earlier than normal, that the temperature didn't get
> up to its normal 190 until I had slowed down below 35 mph. That would

make
> me think that the coolant isn't moving through the radiator fast enough.
>
>
>



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